Sash-balance.



C; A.- BATES.

SASH BALANCE.

APPLICATION FILED JULY 1, I916. 1 9255,6QL Patented Feb. 5, 1918.

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6..A. BATES.

SASH BALANCE, v APPLICATION FILED JULY I H6, LQ559L Patented Feb. 5, 1918.

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CHAUNCEY A. BATES, OF WHITE PLAINS, NEW YORK.

SASH-BALANCE.

Specification of Letters Patent.

Patented Feb. 5, 191%.

Application filed July 1, 1916. Serial No. 107,068.

To all whom it may concern:

Be it known that I, CHAUNCEY A. Barns, a citizen of the United States, residing at White Plains, in the county of VVestchester and State of New York, have invented new and useful Improvements in Sash-Balances, of which the following is a specification.

This invention is an improved sash balance which enables the use of weights, cord, and pulleys to be dispensed with, is entirely out of sight when installed, may be readily adjusted, does not disfigure the window frame, and which operates efficiently to balance the sash.

The invention consists in the features of construction, combination, and arrangement of devices, hereinafter described and claimed.

In the accompanying drawings Figure 1 is an elevation partly in section of a window frame and sash provided with a sash balance constructed and arranged in accordance with my invention.

Fig. 2 is a detail sectional View of the same on the plane indicated by the line aa of Fig. 1.

Fig. 3 is an elevation of the sash balance, showing the same installed in the window frame, the latter being indicated in side elevation, partly in section.

Fig. 4 is a detail elevation of the same, a portion of the window frame and a portion of one of the sashes shown in section.

The window frame 1 and sashes 2 are of the usual construction, the sashes being adapted to slide vertically in the frame, and each sash, in accordance with my invention is provided on one side with a rack plate 3 of suitable length and which extends from the lower side to the upper side of the sash.

The sash balance mechanism embodies a frame a which is here shown as of oblong rectangular form and which is secured 011 one side of the window frame and in practice is concealed between the same and the casings. A pair of bars 5 are arranged vertically and opposite the sides of the frame a and are movable toward and from said frame and are guided on studs 6 which pro ject outwardly from said frame and are provided with threaded ends and with adjusting nuts 7 on their threaded ends. Coil springs 8 are arranged on the guide studs and between the nuts 7 and the ends of the bars 5 and serve to press the bars 5 toward the frame. A pair of shafts 9, which are arranged in reverse order, are provided at their ends with journals 10 which are mounted in bearing openings in the bars 5, the said shafts being arranged transversely of the frame 4. Each shaft is provided at a point near one end with a spur gear 11. Said spur gears extend through slots 12 in the side of the window frame to which the frame 4 is attached and each of the said gears engages the rack plate or bar 3 of one of the sashes, so that when either sash is raised or lowered, the shaft which is geared thereto, is revolved in one direction or the other, according to the direction in which the sash is moved. On each shaft is a sash balancing spring 13, here shown as a coil spring and having one end attached to the shaft as at 1 1 and the other end attached to a stud 15 which proj ects inwardly from one of the bars 5. The springs are so coiled that when a sash is lowered, the consequent rotation of the shaft to which the spring is attached causes the spring to be wound up and to hence exert its tension so that each spring tends to raise and in effect counterbalances one of the sashes, enabling the sashes to be manually raised or lowered very readily and easily, and causing the sashes to remain in any position in which they are stopped. In practice, each wheel 11 is secured on its shaft between a pair of nuts 17 which are screwed on the shaft, to facilitate turning the shafts by first loosening the nuts, independently of the gear wheels, to enable the springs to be tensioned as may he required.

The bars 5 which form bearings for the shafts of the gears and counter-balancing springs being moved toward the frame by the springs 8, keep the gears always in engagement with the rack plates or bars of the sashes and hence compensate for any slight lateral movement of the sashes.

Associated with each spur gear is a stop 18 which is pivoted as at 19 to the frame 4. When turning the shaft to adjust and tension the springs, said stops may be engaged with the spur gears to prevent the latter from rotating. Normally the said stops are out of engagement with the gears.

I-Iaving described the invention, what is claimed is:

In combination with a window frame and a pair of sashes therein, rack elements each secured to one side of one of the sashes, and a sash balance comprising a frame for attachment to the corresponding side of the window frame and provided with an opening and also provided at the sides and near the ends With outwardly extending studs, bars at opposite sides of said frame mount ed on said studs for movement toward and from the frame independently of each other, springs to press the bars toward the frame, a pair of shafts each having its opposite ends mounted in bearings in said bars, gears on said shafts to engage the rack elements, and a coil spring on each shaft and having one end attached to the shaft and one end at tached to one of thebars, said springs coacting with the shafts and gears to counter-balance the sashes.

In testimony whereof I aflix my signature in presence of two Witnesses.

p CHAUNCEY A. BATES. Witnesses:

{FREDERICK T. BURNS,' j ROSALIND E. DoBBIN.

copies o! 1111: patent may be obtained to: five cents each, by addressing the commissioner of rateats,"

7 Washington, D. 0. V 1 r 

